• const searchPopup_search_default = document.getElementById('search-default-content');const searchInput_search_default = document.getElementById('search-default-input'); // 监听实例的弹窗显示状态变化 const observer_search_default = new MutationObserver(() => {// 当弹窗从隐藏变为显示时，执行当前实例的输入框聚焦 if (searchPopup_search_default.style.display !== 'none' && !searchPopup_search_default.hidden) {searchInput_search_default.focus(); // 核心聚焦方法 // 可选：聚焦后选中输入框内内容，方便直接替换（按需开启） // searchInput_.select(); observer_search_default.disconnect(); // 聚焦一次后断开，避免重复触发 }}); // 启动当前实例的监听，仅监听自身弹窗的属性变化，各实例完全独立 observer_search_default.observe(searchPopup_search_default, {attributes: true,attributeFilter: ['style', 'hidden', 'class'] // 仅监听关键属性，性能最优 });

    db calculator online dB unit converter dBm dBμV dBμA conversion free

    The dB unit converter can convert between dBm dBμV dBμA three dB units, this db calculator online can directly convert the required dB units.
    Instructions for use: first select the source unit and target unit to be converted, then enter the value of the source unit, and finally click Calculate to get the value of the target unit.
    When customized to 50 ohms, there will be a difference between the test results and when selecting 50 ohms, if your test system is determined to use 50 ohms, please directly select the default 50 ohms to use.
    If the source unit is the same as the target unit, the page will not display any calculation results, so please select a different unit.
    This tool is provided free of charge by Shenzhen EUT TEST Technology Co. Please do not utilize it maliciously.

    View MoredB conversion formula

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